Yanai Waves in the Deep East Indian Ocean Observed with Seismic Ocean Tomography

Peng, Shirui; Callies, Jörn; Nagura, Motoki; McPhaden, Michael J.

doi:10.1175/JPO-D-24-0107.1

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i

Yanai Waves in the Deep East Indian Ocean Observed with Seismic Ocean Tomography

2025
By Peng, Shirui ; Callies, Jörn ; Nagura, Motoki ; ...
Source: Journal of Physical Oceanography, 55(4), 471-488
Series: PMEL contribution; no. 5644

[PDF-2.20 MB]

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Journal Title:

Journal of Physical Oceanography
Personal Author:

Peng, Shirui ; Callies, Jörn ; Nagura, Motoki ; McPhaden, Michael J.

Peng, Shirui ; Callies, Jörn ; Nagura, Motoki ; McPhaden, Michael J. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory)

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) Less -
Description:

Near-surface measurements of meridional velocity suggest that wind forcing excites equatorial waves in the biweekly band in the Indian Ocean. The characteristics of these waves in the deep ocean are poorly constrained, and it is unclear how well models capture the deep variability. In this work, biweekly temperature variations in a few low vertical modes in the deep east Indian Ocean are observed using seismically generated sound waves. These so-called T waves are generated by earthquakes off Sumatra and received by a hydrophone station off Diego Garcia. Changes in their travel times reflect temperature-induced sound speed variations in the intervening ocean. Regression analysis indicates that these variations are caused by westward-propagating Yanai waves. A comparison between T-wave data and model output shows generally good consistency in biweekly variations dominated by the first three vertical modes, although the biweekly variance differs by up to a factor of 2 between the data and the models. A similar degree of discrepancy appears in the comparison between the models and deep mooring measurements. These results highlight the potential of using T-wave data to study biweekly Yanai waves in the deep equatorial ocean and to calibrate numerical simulations of the variability they cause.
Source:

Journal of Physical Oceanography, 55(4), 471-488
Series:

PMEL contribution; no. 5644
DOI:

https://doi.org/10.1175/JPO-D-24-0107.1
ISSN:

0022-3670;1520-0485;
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PDF
Publisher:

American Meteorological Society
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Journal Article
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urn:sha-512:491ac31ffaed43e22e8b76c3c7dc00e5701f7d15b3d9d7da9fb8ae1705638ee43f18567f1a128276c32460b813a3c40425b266846767fdadcf19f404e7767a17
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Yanai Waves in the Deep East Indian Ocean Observed with Seismic Ocean Tomography

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